What else can be said about The Dark Side of the Moon that hasn’t been said already? It’s one of those records that seems to exist in its own little world. There hasn’t been another quite like it before or since its release, and its impact on nearly every aspect of music—songwriting, production, engineering—is still felt even decades later. In regards to Pink Floyd as a band, the album marked a distinct change of direction in the group’s sound, due in large part to the departure of Syd Barrett, who had been the band’s principal songwriter until his deteriorating mental state forced him to leave the group. Barrett’s mental problems also served as inspiration for much of Dark Side’s concept and themes, which focused on issues like madness, the passage of time, conflict and death.